EFI dual plane conversion
Thread Starter
Instructor
Joined: Jan 2003
Posts: 233
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From: IL
EFI dual plane conversion
Has anyone got info and pictures of replacing a TPI with a dualplane intake and installing fuel rails and some sort of elbow to use a big bore throttle body possibly a LS1 unit. The goal is to not have to change or modify the hood.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Sure have
http://forums.corvetteforum.com/show....php?t=1919844
Not sure why you would want a DP , most are looking for a upper end breathing gain whereas DP is for torque / lower end which you have with TPI intake
http://forums.corvetteforum.com/show....php?t=1919844
Not sure why you would want a DP , most are looking for a upper end breathing gain whereas DP is for torque / lower end which you have with TPI intake
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
Sure have
http://forums.corvetteforum.com/show....php?t=1919844
Not sure why you would want a DP , most are looking for a upper end breathing gain whereas DP is for torque / lower end which you have with TPI intake
http://forums.corvetteforum.com/show....php?t=1919844
Not sure why you would want a DP , most are looking for a upper end breathing gain whereas DP is for torque / lower end which you have with TPI intake
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Drifting
Joined: Feb 2003
Posts: 1,977
Likes: 2
From: San Antonio Texas
Like I said in the other post, Edlebrock has 3 new Elbows for $122, and 2 "Box" type for $150. As for the RPM... the plenums are not the same volume, and this is supposed to throw off the air-fuel ratios from cylinder to cylinder. The best I've come up with is to have two seperate elbows for each side, with one about 2 1/2" longer than the deep one. Have these two draw from a common plenum with the TB. If you look at the pics of the yellow one in the post you'll get the idea. Would they flow enough; would they flow equally.. I don't know. The RPM Air-Gap has got to be the best street intake on the market and they will support 600+ HP. They will make better HP and TQ than a Single-Plane until 6000 RPMs or so; It's been demonstrated for years. But that's with Carbs. Just something I've played with In my mind for a while.
Le Mans Master
Joined: Jan 2002
Posts: 9,036
Likes: 13
From: Edmonton AB
it throws off the A/F ratios from cyl to cyl, then how does the RPM
Air-Gap achieve the numbers it does with a carb?
Originally Posted by Curveit
The best I've come up with is to have two separate elbows for each
side, with one about 2 1/2" longer than the deep one. Have these two
draw from a common plenum with the TB. If you look at the pics of
the yellow one in the post you'll get the idea.
side, with one about 2 1/2" longer than the deep one. Have these two
draw from a common plenum with the TB. If you look at the pics of
the yellow one in the post you'll get the idea.
have the effect of lengthening 4 of the int tracts as far as resonant
waves are concerned?
.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Does this still occur with FI where fuel is being sprayed direct into the port and not being carried through the intake in suspension as with a carb?
Drifting
Joined: Feb 2003
Posts: 1,977
Likes: 2
From: San Antonio Texas
A Carb flows fuel according to the vacume it sees, and Carbs are seperated one side from the other. When one side "sees" more vacume than the other, it will flow more fuel too. Dual-planes in general pull good vacume; velocity, and the RPM flows a lot of CFM too. Motors like mine (86) read sensors from just one bank (side) to adjust fuel flow... a/f ratio. The other bank would be either rich or lean. By extending the length of the shallow side plenum to equal the deep side, they "might" flow equally. There's still the shape of the "elbows" to consider; the deep side runner would have a curve and then that 2 1/2" or so straight shot to the runners, whereas the shallow side would be a straight shot, and then curve into the runners. Might make a difference. Resonance waves?...could change the RPM band with the elbows; the manifold might "see" them as Carb spacers. But I was thinking elbows the same size as the openings on the manifold; shouldn't be much of a restriction or have too big an influence on the power band. All just thinking-out-loud on my part.
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